Method And System For Completing A Well

ABSTRACT

A technique facilitates the detection and measurement of formation properties with various measurement devices, such as logging tools. The technique comprises locating a standard tubular in a well such that the standard tubular extends to a zone of interest with respect to a logging procedure. A transparent tubing is attached to the standard tubing so as to extend along the zone of interest. Additionally, a protective material is directed to the region adjacent the transparent tubing to protect the transparent tubing from detrimental contact with deleterious well fluid.

BACKGROUND OF THE INVENTION

1. Field of the Invention

In many oil production operations, enhanced oil recovery techniques areemployed to facilitate oil production. Many enhanced oil recoveryprojects use thermal recovery methods in which steam is injected toenable recovery of heavy oil. Production from heavy oil reserves isexpanding worldwide.

During enhanced oil recovery operations, formation properties aremonitored at different locations within a reservoir. The monitoredformation properties may include fluid saturation, interfacial fronts,wettability, pressure, temperature, and other properties as a functionof time. Monitoring the various formation properties enables an operatorto identify problems or the potential for problems that can interferewith oil production.

2. Description of Related Art

In some applications, monitoring wells are drilled at select strategiclocations to enable use of logging tools and/or permanent sensors. Iflogging tools are used to detect and measure formation properties, thelogging techniques are carried out in an open hole completion becausestandard casings interfere with the logging measurements. Attempts havebeen made to utilize casings that do not interfere with operation of thelogging tools, however such attempts have met with limited success oftendue to the extremely harsh wellbore environment.

BRIEF SUMMARY OF THE INVENTION

In general, the present invention provides a system and methodology forfacilitating the detection and measurement of formation properties withvarious measurement devices, such as logging tools. The techniquecomprises locating a standard tubular, e.g. casing, in a well proximatea zone of interest to be logged. A tubing that is transparent to signalsassociated with logging tools, e.g. non-metallic and non-magnetic casingor liner, is attached to the standard tubing so as to extend along thezone of interest. Additionally, a protective material is directed to theregion adjacent the transparent tubing to protect the transparent tubingfrom detrimental contact with deleterious well fluid.

BRIEF DESCRIPTION OF THE DRAWINGS

Certain embodiments of the invention will hereafter be described withreference to the accompanying drawings, wherein like reference numeralsdenote like elements, and:

FIG. 1 is a schematic view of a well system utilizing a transparenttubing to facilitate a logging operation, according to an embodiment ofthe present invention;

FIG. 2 is a schematic view of a well system in which an observation wellis positioned between a water injection well and a production well,according to an embodiment of the present invention;

FIG. 3 is a view of one example of a transparent tubing employingsensors, according to an embodiment of the present invention;

FIG. 4 is a view of a well system having a transparent tubular and afluid injection system, according to an embodiment of the presentinvention;

FIG. 5 is a view of a well system having a transparent tubing and aninternal fluid removal pumping system, according to an embodiment of thepresent invention;

FIG. 6 is a view of a well system having a transparent tubing and afluid recirculation system, according to an embodiment of the presentinvention;

FIG. 7 is a view of a well system with a casing having a perforated zonewhich is to be removed to facilitate a logging operation, according toan embodiment of the present invention; and

FIG. 8 is a view of the well system illustrated in FIG. 7 in which atransparent casing has been deployed to replace the removed section ofcasing, according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the following description, numerous details are set forth to providean understanding of the present invention. However, it will beunderstood by those of ordinary skill in the art that the presentinvention may be practiced without these details, and that numerousvariations or modifications from the described embodiments may bepossible.

The present invention relates to a system and method for completing awell. For example, the system and method can be used for drilling andcompleting observation wells used in enhanced oil recovery applications.Generally, standard metal tubing is used in combination with one or moresections of transparent tubing, which may be non-metallic, non-magnetictubing that is transparent with respect to signals associated withmeasurements made by logging tools. The standard tubing and thetransparent tubing may comprise a variety of casings, including liners,used in observation wells or other suitable wells. Additionally, amaterial, such as a protective fluid, is disposed adjacent thetransparent tubing to protect the tubing from deleterious well fluid.

In one specific example, an observation well is drilled slightlyoverbalanced using oil-based mud. The resulting wellbore is lined with astandard casing to a specific well zone of interest for logging. Atransparent casing is then installed at the zone of interest andremovably attached to the standard casing by an attachment mechanism,such as a liner hanger. The oil-based mud is subsequently isobaricallydisplaced down through the casing and up through an annulus between thecasing and the open hole with a specially formulated protective fluid,such as a non-aqueous fluid. The protective fluid may be designed toaugment some aspect of logging by, for example, matching the acousticimpedance of the casing, e.g. liner.

The non-aqueous fluid is generally benign to epoxy and high-temperaturethermoset resins. Consequently, the injection of non-aqueous fluidsisobarically into and around the transparent casing helps prevent harsh,detrimental, aqueous reservoir fluids from coming into contact with thetransparent casing. The transparent casing may be formed of, forexample, a polymer material, a thermoset-based composite, or anothermaterial that could otherwise undergo severe degradation and/orhydrolyses.

In this specific example, the pressure differential across the wall ofthe transparent casing is relatively low which allows the casing to bedesigned with a relatively thin wall thickness. The use of a thin wallcan be helpful for logging tools with short effective depths ofinvestigation, such as nuclear magnetic resonance tools. In someapplications, the protective fluid placed in the annulus between thetransparent casing and the open hole may be designed to set if and whennecessary. Furthermore, the removable attachment mechanism enables thetransparent casing to be retrieved for inspection, repair, and/orreplacement. The material of the transparent casing also is drillablewhich allows it to be drilled through if necessary. In someapplications, the transparent casing is fitted with one or more of avariety of sensors or other tools that enable continued enhanced oilrecovery monitoring.

Referring generally to FIG. 1, one embodiment of a well system 20 isillustrated for use in a wellbore 22. The well system 20 comprises astandard tubing 24, e.g. a well casing 26, deployed along wellbore 22into proximity with a zone of interest 28. The zone of interest 28 maycomprise a zone that is to be logged to collect data on a surroundingformation 30. It should be noted that well casing 26 may comprise avariety of standard casings, including liners, which are typicallyformed from a metal material.

Well system 20 further comprises a transparent tubing 32 deployedadjacent the zone of interest 28 in, for example, an open hole section34 of wellbore 22. In the example illustrated, transparent tubing 32 isdeployed at least partially through the zone of interest 28 between alower casing shoe 36 and an upper casing shoe 38. The transparent tubing32 may comprise a transparent casing and may be attached to standardtubing 24 by an attachment mechanism 40. By way of example, attachmentmechanism 40 comprises a liner hanger. In some embodiments, theattachment mechanism/liner hanger 40 comprises a packer sealing linerhanger to provide isolation with respect to an upper formation layer.The liner hanger 40 or other type of attachment mechanism also mayprovide a releasable attachment to enable retrieval of transparenttubing 32.

The transparent tubing 32 comprises a non-metallic, non-magnetic tubingthat is transparent with respect to the operation of logging tools orother related tools that are used to obtain information on surroundingformation 30 in the zone of interest 28. In other words, the transparenttubing 32 does not interfere with logging measurements. One embodimentof transparent tubing 32 is formed from a polymer-based material, suchas fiber reinforced plastic, but such materials can be susceptible toaqueous fluids (e.g. brine or water) and other corrosive fluids in thewell environment. A protective fluid 42, such as a liquid, foam, slurry,gel (which can be triggered to set and become solid), or gas, isdeployed adjacent transparent tubing 32 to isolate and protect thetransparent tubing 32 from deleterious fluids, such as aqueous fluids(e.g. brine or water) or other problematic fluids found in the wellenvironment. The protective fluid 42 can be located in an annulus 44between transparent tubing 32 and a surrounding wellbore wall 46 in openhole section 34. The protective fluid 42 may also be located inside thetransparent tubing 32.

As illustrated in FIG. 1, the use of transparent tubing 32 facilitates avariety of logging and other data collection procedures. For example, alogging tool 48 can be lowered through wellbore 22 into the zone ofinterest 28 by a conveyance 50, e.g. a wireline or coiled tubing. Alogging truck 52 may be used in cooperation with surface equipment 54 todeploy, retrieve, and operate logging tool 48 during a loggingoperation. The logging tool 48 may comprise a variety of tools,including resistivity tools, nuclear magnetic resonance tools, gamma raytools, neutron tools, sonic tools, and other logging related tools. Inone example, the logging tool 48 is designed to measure the chemicalcomposition of a sample using spectroscopy or another appropriatetechnique for such measurement. The measurements can be performed atdesired time intervals based on the expected efficiency of the enhancedoil recovery operation or on the sweep efficiency of an injected fluid.The measurements may be used to calculate the change in formation fluidcontent by providing the saturation of different fluids. In someapplications, chemical reactions may change the nature of the fluids inthe zone of interest. In other cases, a sweeping fluid may come into thezone of interest and bring new fluids with it. The logging tool or tools48 can be used to measure the nature, saturation, and/or spatialdistribution of such different fluids within the given zone. In someembodiments, the nature of injected fluids may be such that thewettability of the formation changes. Techniques such as nuclearmagnetic resonance may be used to provide information on the wettabilityof the formation.

In one operational example, the wellbore 22 is initially drilled in anoverbalanced condition using oil-based mud. The wellbore 22 is thencased with standard casing 26 to a depth just above the zone of interest28. The standard casing 26 may be cemented into place to achieve totalzonal isolation, to meet regulatory requirements, and/or to ensure goodmechanical strength. It should be noted that in some applications,multiple casing strings above the liner hanger 40 are possible. Thetransparent tubing 32, e.g. casing, is subsequently attached to thestandard casing 26 in a manner that is removable and serviceable. Forexample, the transparent tubing 32 may be removably attached to thestandard casing 26 by liner hanger 40.

The transparent tubing 32 is placed into the wellbore 22 in a mannerdesigned to minimize interference with reservoir measurements taken frominside the transparent tubing 32. In at least some well environments,the reservoir, the fluid in the reservoir, the formation properties, thetemperature, and other environmental parameters may have a detrimentaleffect on the transparent tubing 32. However, the protective fluid 42can be used to protect the transparent tubing 32. Additionally, theretrievability of the transparent tubing 32 enables repair orreplacement of the transparent tubing. Consequently, the risk of losingthe entire wellbore is much lower.

In at least some operations, the casing string is not cemented in place.Instead, the connection mechanism comprises the liner hanger 40 combinedwith a sealing packer 56 to provide zonal isolation with respect to theupper formation layer. In any event, the transparent tubing 32 need notbe cemented into place unless desired, which opens up many service andretrieval options.

Liner hanger 40 enables retrieval of the transparent tubing 32. This canbe accomplished by killing the well so that a retrieval tool can be rundownhole to retrieve liner hanger 40 and transparent tubing 32 as manytimes as desired over the life of the reservoir. However, if solidsblock the transparent tubing 32 (or a portion of the transparent tubing)at a downhole location, the well operator may not be able to retrievethe entire transparent tubing. In such event, the lower zone may beredrilled to remove the buried transparent casing and the solid fill.

Following the initial overbalanced drilling, but prior to originalinstallation of the tubing string with the transparent tubing 32, acomplete displacement of the oil-based mud may be performed with anon-aqueous fluid. The use of the non-aqueous fluid provides time andpositive hydrostatic pressure to displace reservoir fluids in the nearwellbore formations. As a result, the barrier provided by the protectivefluid 42 extends beyond the wellbore and into the permeable formation toprovide an additional degree of isolation from deleterious reservoirfluids, e.g. water, that would otherwise contact the transparent tubing32. In some embodiments, before this step, the inner wall of the openhole section 34 may be sealed with a layer of polymer or resin tominimize leakage of protective fluid 42 into the formation 30 and, inturn, help maintain an overbalanced condition in the open hole section34.

The actual running of the completion assembly is relativelystraightforward. In the example illustrated and described, the overallstring comprises lower casing shoe 36 designed to seal desiredcomponents to the bottom of the string, e.g. to the bottom of thetransparent tubing 32. In some embodiments, a ported sub can bepositioned at the bottom of the string, e.g. at the bottom of thetransparent tubing 32, to facilitate fluid communication and/orsampling. The ported sub may be generally shaped like a bullet to enableeasier running into the wellbore 22. Alternatively, circulation can beachieved along the length of the transparent tubing 32.

In an alternate arrangement, attachment mechanism 40 comprises a solidconnection, such as a threaded connection between the standard casing 26and transparent tubing 32. The transparent tubing 32 may also comprise aconnection end formed of the same transparent material and fused for aseamless connection. The transparent tubing 32 is then connected to thetop of liner hanger 40 with, for example, an integrated sealing packerassembly to form the liner hanger with sealing packer 56.

According to one embodiment, the tubing string components are initiallyassembled, e.g. preassembled, and run into the wellbore 22. The linerhanger 40 is set to “space out” the landing such that there issufficient overlap of the liner hanger and the previously set andcemented standard casing string 26. The weight of the transparent tubing32 is supported by the standard casing 26. Prior to setting the linerhanger 40 and releasing, a fluid is circulated in the casing 26 andtransparent tubing 32. The fluid is selected to function as a protectivefluid 42 and may vary depending on the type of material used to formtransparent tubing 32. For example, if the transparent tubing 32 is morelikely to be attacked by aqueous fluid, the circulating protective fluid42 may be an oil or other non-aqueous fluid.

The protective fluid 42 may be circulated down the entire length of arunning string, through the liner hanger 40, down the transparent tubing32, up through annulus 44 in open hole section 34, and inside the outercemented standard well casing 26 such that the entire running assemblyis surrounded by protective fluid 42, e.g. non-aqueous fluid. Theprotective fluid minimizes, and potentially eliminates, contact betweenharsh reservoir fluids, e.g. water, and the entire transparent tubing32.

In some applications, the protective fluid 42 is selected withcharacteristics that enable triggering of the fluid to set if and whennecessary. For example, certain non-aqueous organic fluids may bedisplaced into the annulus 44 and activated/triggered to set whendesired. Examples of such protective fluids include organic sealantssuch as those used in zonal isolation applications.

Once the transparent tubing 32 is properly located and completely bathedin protective fluid 42, a liner hanger setting tool is activated toallow the liner hanger 40 to engage the standard casing 26 and totransfer the weight of the transparent tubing 32 from a running stringto the cemented standard casing 26. Once the liner hanger 40 issupporting the transparent tubing 32, the liner hanger setting tool canagain be activated to allow setting of the sealing packer 56 to providethe required seal and consequent isolation of the reservoir.

Upon setting the sealing packer 56, the annulus region between thecemented standard casing 26 and the running string is pressure tested toensure a positive seal. After completing the pressure test, the runningstring and liner hanger setting tool are disengaged from the linerhanger 40 to allow forward circulation above the sealing packer 56. Atthis stage, protective fluid 42, e.g. oil or other non-aqueous fluids,can again be circulated down the running string to ensure the entirewellbore is filled with this protective fluid barrier at a slightlyoverbalanced condition for added protection. In this example, thepressure differential across the transparent tubing 32 is relatively lowif not insignificant. Consequently, the transparent tubing may bedesigned with a relatively thin wall thickness which facilitates the useof logging tools with short effective depths of investigation, such asnuclear magnetic resonance tools.

Once a positive indication is received that uncontaminated protectivefluid 42, e.g. oil or other non-aqueous fluid, has completely filled thewellbore with “clean” surface returns, the running string can be removedfrom the wellbore leaving only the sealing packer 56/liner hanger 40 andthe monitoring string, e.g. transparent tubing 32, below the linerhanger 40 in wellbore 22. At this stage, installation of the transparenttubing 32 is achieved, and further completion of the well can beconducted according to normal completion routines. For example, wellheadassemblies and other surface equipment can be installed. Environmentalbarriers for the surface and reservoir monitoring equipment can be runinto the wellbore 22 and placed inside the transparent tubing string 32.This allows reservoir measurements to be taken without the interferencethat would otherwise occur with traditional casing installations ofsteel and cement.

Referring again to FIG. 1, an illustration is provided of a completedinstallation which allows various logging operations to be conducted inthe zone of interest 28. The logging tool 48 is operated withintransparent tubing 32 which, as described above, is formed from anon-metallic, non-magnetic material to facilitate the detection andmeasurement of desired parameters during the logging operation.

Although the transparent tubing 32 can be used in cooperation withstandard tubing 24 in a variety of well-related applications, thetechnique is useful in a monitoring well 58 positioned between a waterinjection well 59 and a production well 60 of an enhanced oil recoveryoperation, as illustrated in FIG. 2. A variety of logging tools 48 andor sensors 62 can be used in cooperation with transparent tubing 32 todetect well-related, environmental parameters. For example, monitoringwell 58 can be used to detect a moving water front 64. Data is providedto a control system 66 to enable appropriate corrective or remedialaction, i.e. adjustment of water injection rate and/or volume. In someapplications, control system 66 may be part of logging truck 52.

In FIG. 3, one embodiment of transparent tubing 32 is illustrated as acasing suspended from standard casing 26 by liner hanger 40. In thisembodiment, permanent sensors are combined with transparent tubing 32and may comprise one or more internal sensors 68 and/or one or moreexternal sensors 70. The sensors 68 and/or 70 may be mounted to orembedded in transparent tubing 32. Additionally, the sensors aredesigned to communicate data to the surface via communication lines 72which may be permanently installed wires, fiber optics, or wirelesscommunication lines. Depending on the type of sensor and the environmentin which the sensors are used, power may be provided to the sensors 68,70 from the surface, or by battery packs located downhole. The sensors68, 70 may be employed to provide continuous information on physicalproperties and their time dependence may be used to decide when toperform a complete logging operation. The sensors may include pressuresensors, temperature sensors, resistivity sensors, and other sensorsdesigned to detect and/or measure desired well-related parameters.

In some applications, protective fluid 42 is maintained in the annulus44 between transparent tubing 32 and the surrounding wellbore wall. Asillustrated in FIG. 4, a protective fluid injection system 74 can beused to deliver protective fluid downhole through an injection tubing76. In this example, shoe 36 is a ported shoe, and flow controlequipment 78 is used to control flow down through injection tubing 76 toported casing shoe 36. Injection system 74 can be used to maintain thepressure of protective fluid 42 within a desired, relatively narrowrange. By keeping the protective fluid pressure substantially equal tothe formation pressure, the protective fluid is prevented from invadingthe surrounding formation while simultaneously preventing formationfluid from contacting transparent tubing 32. The protective fluid 42 maybe chosen so as to be immiscible with and of similar viscosity to theformation fluid to help maintain pressure balance and to preventfingering of the sweep front.

As illustrated in FIG. 5, deleterious fluids, such as water, can also beremoved using a submersible pump 80 and/or injection system 74. If adeleterious fluid invades the zone of interest 28 surroundingtransparent tubing 32, the fluid can be removed by pump 80 via outflowtubing 82 and appropriate flow control mechanisms 84. Additionally,protective fluid 42 can be injected via injection system 74 to ensurethe transparent tubing 32 is protected. The pumping and/or injectionoperations can be performed either intermittently or continuously on aregular basis to maintain protection of transparent tubing 32. Further,the formation fluid having seeped out into the protective fluid and beenpumped to the surface may be sent to a laboratory for chemical analysis.

Another embodiment is illustrated in FIG. 6 and includes a recirculationsystem 86. In this embodiment, recirculation system 86 can be used tochange the fluid or the nature of the protective fluid 42 filling theannulus 44 between transparent tubing 32 and the surrounding wellborewall 46. A tubing 88 is deployed down through transparent tubing 32 andsealed with respect to an interior of the transparent tubing via apacker 90. The tubing 88 may extend through a lower ported sub. Therecirculation system 86 may be used to circulate protective fluid downthrough tubing 88, into the annulus 44 surrounding transparent tubing32, and up through circulation ports 92 of liner hanger 40.Alternatively, the protective fluid may be delivered down through anannulus surrounding the standard casing 26, through circulation ports 92of liner hanger 40, through annulus 44 surrounding transparent tubing32, and then up through tubing 88. The recirculation of fluid also maybe used to remove undesirable, invading fluids.

Referring generally to FIGS. 7 and 8, transparent tubing 32 may be usedalong standard tubing 24 at locations other than a location below thebottom of the standard tubing. In some applications, the transparenttubing is placed at an intermediate location along the length of, forexample, permanent standard casing 26. In one example, a perforatedsection 94 of an existing well casing (see FIG. 7) is removed andsubstituted with the transparent tubing 32 (see FIG. 8). Once the oldsection of standard casing is replaced with transparent tubing 32,logging measurements can be conducted without interference.

Replacement of casing sections with transparent tubing 32 can be appliedto specific wells selected from multiple wells used in multiple zoneproduction. Later in the life of the wells, some or all of the multiplezones may require an enhanced oil recovery operation that can beimproved by converting some of the wells in the well field to monitoringwells. In such cases, sections of standard casing can be, for example,machined and removed from the well or dropped to a rat hole at thebottom of the well. The transparent tubing 32, e.g. casing, is thenlowered into the well and hung at the desired depth at a bottom positionor an intermediate position along the standard casing. FIG. 8illustrates a transparent tubing 32 that is sealed at the top tostandard tubing 24. However, the invention is not limited to thisarrangement, and the transparent tubing 32 may be sealed on both ends tothe top and bottom sections of casing 26.

Transparent tubing 32 may be used in cooperation with standard tubing tofacilitate logging operations in a variety of wells, such as enhancedoil recovery monitoring wells. The size, shape, and structure of thetransparent tubing may vary depending on the specific logging operationand environment. Additionally, the material from which transparenttubing 32 is constructed may vary according to environmental factors,protective fluid, potential deleterious fluids, logging equipment, andother operational parameters. Furthermore, the overall system mayutilize a variety of protective materials, such as protective fluidsthat are delivered downhole by suitable delivery systems. Similarly,many types of attachment mechanisms can be used to attach thetransparent tubing 32 to the standard tubing 24. In some embodiments,the attachment mechanisms enable easy removal and/or replacement of thetransparent tubing.

Accordingly, although only a few embodiments of the present inventionhave been described in detail above, those of ordinary skill in the artwill readily appreciate that many modifications are possible withoutmaterially departing from the teachings of this invention. Suchmodifications are intended to be included within the scope of thisinvention as defined in the claims.

1. A method of forming an observation well in an earth formation,comprising: locating a standard casing in a well above a zone ofinterest; removably attaching a transparent casing to the standardcasing so the transparent casing is adjacent the zone of interest. 2.The method as recited in claim 1, further comprising directing aprotective fluid to a region between the transparent casing and thesurrounding earth formation to protect the transparent casing fromcontacting deleterious fluid.
 3. The method as recited in claim 1,further comprising performing a logging operation while moving a loggingtool along an interior of the transparent casing.
 4. The method asrecited in claim 1, wherein locating the standard casing in the wellcomprises cementing the standard casing in place.
 5. The method asrecited in claim 1, wherein removably attaching the transparent casingto the standard casing comprises attaching the transparent casing to thestandard casing with a liner hanger.
 6. The method as recited in claim1, further comprising forming the transparent casing from a drillablematerial.
 7. The method as recited in claim 2, wherein directing theprotective fluid to the region between the transparent casing and thesurrounding earth formation comprises directing a non-aqueous fluid toisolate the transparent casing from aqueous fluids.
 8. The method asrecited in claim 2, wherein directing the protective fluid to the regionbetween the transparent casing and the surrounding earth formationcomprises directing one of a liquid, foam, slurry, gel, or gas.
 9. Themethod as recited in claim 1, wherein removably attaching thetransparent casing to the standard casing comprises supporting theweight of the transparent casing with the standard casing.
 10. Themethod as recited in claim 1, further comprising mounting at least onesensor on the transparent casing.
 11. The method as recited in claim 2,further comprising utilizing a fluid circulation control system tochange the protective fluid filling the region between the transparentcasing and the surrounding earth formation.
 12. The method as recited inclaim 1, wherein locating the standard casing in the well comprisesremoving a section of existing casing; and wherein removably attachingthe transparent casing to the standard casing comprises positioning thetransparent casing in an open section left after removing the section ofexisting casing.
 13. A system for use in a well, comprising: a standardcasing deployed in a wellbore above a logging zone; a transparent casingdisposed in the logging zone; and an attachment mechanism by which thetransparent casing is retrievably attached to the standard casing. 14.The system as recited in claim 13, wherein the attachment mechanismallows removal of the transparent casing from the standard casing. 15.The system as recited in claim 13, wherein the attachment mechanismcomprises a liner hanger.
 16. The system as recited in claim 13, furthercomprising a protective fluid disposed around the transparent casing.17. The system as recited in claim 16, wherein the protective fluid isone of a liquid, foam, slurry, gel, or gas.
 18. The system as recited inclaim 13, further comprising at least one sensor mounted to thetransparent casing.
 19. The system as recited in claim 13, wherein thetransparent casing is formed of fiber reinforced plastic.
 20. The systemas recited in claim 13, further comprising a fluid injection system toinject a protective fluid around the transparent casing.
 21. The systemas recited in claim 13, further comprising a fluid pump positioned inthe transparent casing to remove deleterious fluids.
 22. A method,comprising: deploying a tubing in a well such that a portion of thetubing is metal tubing and a connected portion is non-metallic,non-magnetic tubing; locating the non-metallic, non-magnetic tubing in azone of interest to be logged; and providing a protective fluid barrieralong the non-metallic, non-magnetic tubing.
 23. The method as recitedin claim 22, further comprising logging the zone of interest via alogging tool moved along an interior of the non-metallic, non-magnetictubing.
 24. The method as recited in claim 22, further comprisingmounting a sensor on the non-metallic, non-magnetic tubing to detect awell parameter.
 25. The method as recited in claim 22, whereinimmediately before the protective fluid barrier is provided, the zone ofinterest is sealed using a polymer or resin.
 26. A system, comprising: ametal tubing extending along a wellbore to a zone of interest; anon-metallic, non-magnetic tubing deployed in the zone of interest; anattachment mechanism by which the non-metallic, non-magnetic tubing isattached to the metal tubing; and a protective material deployed alongthe non-metallic, non-magnetic tubing to protect the non-metallic,non-magnetic tubing against deleterious well fluids.
 27. The system asrecited in claim 26, wherein the attachment mechanism comprises a linerhanger.
 28. The system as recited in claim 26, further comprising asensor attached to the non-metallic, non-magnetic tubing.